has material basis in autosomal dominant disease developmental and epileptic encephalopathy developmental and epileptic encephalopathy 70 disease_ontology A developmental and epileptic encephalopathy characterized by onset in the first months of life of of epileptic spasms or seizures, hypsarrhythmia on EEG, severely delayed psychomotor development with impaired or absent walking and language skills, and moderate to severe intellectual impairment that has_material_basis_in heterozygous mutation in the PHACTR1 gene on chromosome 6p24.1. DEE70 MIM:618298 DOID:0112206 early infantile epileptic encephalopathy 70 autosomal dominant inheritance